Latest Peer-to-Peer Technologies II Artjom Lind 1

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Arron Bishop
5 years ago
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1 Latest Peer-to-Peer Technologies II Artjom Lind 1

2 Outline Last presentation Intro Peer-to-Peer SIP TCP Traversal Conclusions Artjom Lind 2

3 Last Presentation P2P Systems Structured Centralized Decentralized Unstructured Pure P2P Hybrid Technologies Distributed Hash Table Super-peer Distributed Cache Artjom Lind 3

4 Introduction Centralized Services -> P2P SIP -> Peer-to-Peer SIP DNS -> Peer-to-Peer NS Networking TCP Traversal F2F? No demo today Artjom Lind 4

5 Peer-to-Peer SIP (P2P-SIP) Centralized SIP Registrar servers, User Agents (Clients) Clients register on server Clients request contacts using server DB P2P-SIP Registrar servers -> P2P Overlay Network Clients register on some node in p2p network Clients request contacts using distributed DB Artjom Lind 5

6 Peer-to-Peer SIP (P2P-SIP) INVITE REGISTER => Bob s host Contact: iptel.org Alice s host GOOD: BAD: maintenance, configuration, controlled infrastructure, Quick search -> quick invite responses not scalable, single point of failure INVITE alice REGISTER P2P Overlay Network Contact: Bob s host Alice s host GOOD: BAD: scalable, fail-tolerant slow search -> delay in invite responses Artjom Lind 6

7 Overlay Network User/Resource records are distributed over peers in network (DHT) P2PSIP Client P2PSIP Peer P2PSIP Bootstraping Peer User Agent Client Protocol Peer Protocol Artjom Lind 7

8 P2PSIP Peers Hold part of user/resource records (remember DHT: Chord, DHT Tree) Add/Remove records in DHT Look-up for resources Serve one or multiple clients (super-node) Registrar server (sip-register, sip-invite,...) Proxy/redirect Gateway Signaling Media relay Artjom Lind 8

9 Register/Invite Register Alice P2PSIP Client P2PSIP Peer P2PSIP Bootstraping Peer User Agent Client Protocol Peer Protocol Artjom Lind 9

10 Register/Invite Insert new user/resource record into DHT Register Alice P2PSIP Client P2PSIP Peer P2PSIP Bootstraping Peer User Agent Client Protocol Peer Protocol Artjom Lind 10

11 Register/Invite Alice stored here DHT algorithm for storing new entry Alice P2PSIP Client P2PSIP Peer P2PSIP Bootstraping Peer User Agent Client Protocol Peer Protocol Artjom Lind 11

12 Register/Invite Alice stored here Bob Invite Alice Alice P2PSIP Client P2PSIP Peer P2PSIP Bootstraping Peer User Agent Client Protocol Peer Protocol Artjom Lind 12

13 Alice stored here Route Invite to Alice Register/Invite Lookup Alice Bob Invite Alice Alice P2PSIP Client P2PSIP Peer P2PSIP Bootstraping Peer User Agent Client Protocol Peer Protocol Artjom Lind 13

14 Register/Invite Alice stored here Route Invite to Alice Bob Invite Alice P2PSIP Client P2PSIP Peer P2PSIP Bootstraping Peer User Agent Client Protocol Peer Protocol Artjom Lind 14

15 Register/Invite Bob Ringing Invite Alice P2PSIP Client P2PSIP Peer P2PSIP Bootstraping Peer User Agent Client Protocol Peer Protocol Artjom Lind 15

16 Signaling/Media Relay Blackboard Artjom Lind 16

17 Questions about P2P-SIP Artjom Lind 17

18 Networking NAT Traversal By controlling device NAT-PMP, UpnP By discovering behaviour UDP Traversal STUN, UDP Hole Punching TCP Traversal STUNT NATBlaster P2PNat Artjom Lind 18

19 TCP Traversal Basics of STUNT approach Similar to STUN for UDP traversal Public server Mediating host A and B to establish direct connection from behind the NAT devices Spoofing the TCP seq# in packet headers Artjom Lind 19

20 Questions about TCP Traversal Artjom Lind 20

21 Conclusions P2P is advancing in the area of Client-Server DNS -> P2P-NS, SIP -> P2P-SIP Pirate Bay switched to fully DHT (no tacker) Bootsrap? Magnet links? Pirate Search engine Uses a peer connected to bittorrent network Artjom Lind 21

22 Refereces [1] SIP PEER: A Session Initiation Protocol (SIP)-based Peer-to-Peer Internet Telephony Client Adaptor 2005 Kundan Singh and Henning Schulzrinne Department of Computer Science, Columbia Universit {kns10,hgs}@cs.columbia.edu [2] Characterization and Measurement of TCP Traversal through NATs and Firewalls Saikat Guha, Paul Francis. Cornell University {saikat,francis}@cs.cornell.edu [3] Artjom Lind 22

23 Questions? Artjom Lind 23

P2PSIP, ICE, and RTCWeb

P2PSIP, ICE, and RTCWeb T-110.5150 Applications and Services in Internet October 11 th, 2011 Jouni Mäenpää NomadicLab, Ericsson Research AGENDA Peer-to-Peer SIP (P2PSIP) Interactive Connectivity Establishment